Peninsula66

Thank you for explaining John!

I'm finding mixed responses regarding the results when doing a direct swap with an edelbrock 1406 / Holley street avenger. Can I expect both of these to be eligible replacements, or do I need to worry about fitting, clearance, etc..?

Bluestripe67

Your fuel line will need modification for the side inlet on the Edelbrock and you will need a different air filter base, possibly a "drop base" type due to the carb opening being larger. Not sure if differences exist with the Holley. Dennis

66since71

1850 Holley, and swap out the primary bowls. Fuel line works, and you only have to sweat the choke hook up

provette67

Here is one already restored

http://cgi.ebay.com/ebaymotors/Holle...s#ht_598wt_956

midyearvette

that is a very good price for that carb....jmo.....

dkleather

Hope this isn't OT but where can I get those plugs to plug the hot slot holes that John shows? Can they be installed without removing the intake? Thanks. Dave

Peninsula66

Thank you, everyone, for the great responses!

Got the carb off for a rebuild, hopefully it goes well!

JohnZ

Depends on the casting. Some will accept 7/16" steel cup plugs, some have slightly larger holes and need to be tapped 1/4" NPT and use allen-head 1/4" NPT thread plugs.

dkleather

Thank you, John. Great picture as always!! Dave

bergie44

My 1966 327 275HP has a carter AVS that leaks and runs terribly the base is eaten away due a previous owner not putting the SS heat shield back on. I want to replace the Carter with an Edelbrock 1406 or
Edelbrock Thunder AVS series 1805. I have heard the 1805 is a closer match to the carter AVS that is currently on the car. Does anyone have an opinion on which is better? Which fits better? Will the stock air cleaner fix either carb? I have seen some other posts that talk about the Edelbrook 1406 Replacement and they all refer to the hassle of dealing with the Electric choke. What hassle is there? Don't you just find a switched 12v source (like the windshield washer motor)?

What is the FelPro Part number for the SS Insulator that goes under the carburator? I have looked and looked and all I find is the Quadrajet one.
Thanks

JohnZ

What intake manifold do you have? There was no 327/275hp in a Corvette.

bergie44

The manifold is a 3872783

fla-buckeye

John Z, I'm sure your probably tired of this subject, but, I must ask. Have a '64 300hp and will be removing the carb for a look see. Would like to have a couple plugs on hand if this hasn't been done, seems as though locating 7/16" plugs are kind of ellusive, any suggustions?

Also noticed that the insulated gasket is placed on the manifold, and base gasket is located where insulated should be, maybe this was their way of blocking off passeges? Any thoughts are appreciated.

Nowhere Man

a good hard wear store should have them.

dplotkin

Holly is always the better choice for competition/max performance. AFB's are far better street carbs, less risk of leaks & in most ways technically superior.

Dan

JohnZ

Any good auto parts store that carries the Dorman line (all the orange drawers) should have whatever plug size you need; you won't know what you need until you pull the carb and measure the two holes in the carb pad on the intake.

From the manifold up, you should have gasket, insulator, stainless baffle, then carburetor; the gasket and insulator have the holes and slot, and the stainless baffle doesn't.

TeaEye

Thanks for posting info! Yeah, I know its an old post..... I just sealed my two exhaust ports a few minutes ago.

I used the 7/16 steel cups. Dorman part number 555-002. My Carquest shop charged $.79 per plug plus tax. Saw a bunch online. was gonna buy two for $5.69 each. Would have been a mistake....10 in a bag! Can also try Amazon, EBay, Advanced Auto, etc.

At first it looked like the cap was way too big for the opening. Then I took a 7/16 drill bit to the port and surprisingly carbon started to come off the sides. While drilling had a vac inhaling the chips. Afterwards, I took a wire brush and did some more cleaning of the port. Then, the permetex, I used the liquid on the brush and persuaded the caps into the holes. Was a good tight fit!

Cheers!

R66

I use a phenolic spacer set with aluminum plates under the carburetor to keep the heat from the carb when you shut if off and when it is running. The quadajet people learned this years ago. Plug the heat passages if you are not driving it in cold weather, I do it at the heads, but you can do it at the intake. Also insulate the fuel line from the pump to the carb or put in a segment of rubber hose to help dissipate the heat.
Go to the Holley web site, they know 'their' carbs. You can send them a email and they will make a recommendation.
If you insist on changing to a different carb, the Eldebrock AFB, formally Carter, will provide better mileage and great street performance.
I'll make you a deal for the original Holley if you are going to get rid of it. I have a few (10 or 12) of both Holleys and AFBs I have ran over the years. I'm not real smart, but I have learned the hard way over the last 1/2 century and more.

Johnny 66

Great info in this old thread! My 66 has been sitting for a couple years and does not run. Biggest problem is that when I do get it started and running it will stall as soon as I touch the gas pedal. The Accelerator pump is not squirting fuel. I'm assuming the entire thing is just gummed up from sitting for so long, but I'm looking at doing a carburetor replacement rather than rebuild the old one. It's already been rebuilt a couple times, and I don't have much patience! Would like to just bolt on something reliable that doesn't require much of a conversion regarding choke etc.

veeeight

Could somebody tell me the reason why the hot slot was machined into the manifold and why only on the 300HP and not the 350HP. I have wondered about this as my 300HP has the original manifold with the hot slot.